Apparently the Chinese manufacture perfect diamonds much cheaper than what can be mined. The price of diamonds has collapsed and there is nothing De Beers can do about it.
https://youtu.be/qf78SpQj37o?si=7bBabGXqzKDiD_MU
If you educate yourself on the importance of how a diamond is cut you could pick out a diamond that would put a Tiffany natural diamond to shame. I own real and lab and wish I'd never purchased the real. And I say this as someone who used to sell real diamonds.